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* LLM Service
*
* Handles LLM provider configuration, initialization, and API calls.
* Supports multiple providers via connection string configuration.
*
* Configuration:
* Use environment variables QUIQR_LLM_PROVIDER_0 through QUIQR_LLM_PROVIDER_9
*
* Format: provider://credentials@endpoint?params
*
* Examples:
* - QUIQR_LLM_PROVIDER_0="openai://sk-abc123"
* - QUIQR_LLM_PROVIDER_1="bedrock://token?region=eu-central-1"
* - QUIQR_LLM_PROVIDER_2="anthropic://sk-ant-xyz"
* - QUIQR_LLM_PROVIDER_3="google://api-key?location=us-central1"
* - QUIQR_LLM_PROVIDER_4="azure://key@endpoint.openai.azure.com?deployment=gpt4"
*/
import { generateText, LanguageModel } from 'ai';
import { createAnthropic } from '@ai-sdk/anthropic';
import { createAmazonBedrock } from '@ai-sdk/amazon-bedrock';
import { createOpenAI } from '@ai-sdk/openai';
import { createGoogleGenerativeAI } from '@ai-sdk/google';
import { createAzure } from '@ai-sdk/azure';
import { createMistral } from '@ai-sdk/mistral';
import { createCohere } from '@ai-sdk/cohere';
/**
* Supported LLM provider types
*/
export type LLMProviderType = string;
/**
* LLM request parameters
*/
export interface LLMRequest {
model: string;
prompt: string;
temperature?: number;
maxTokens?: number;
provider?: string; // Optional explicit provider ID
}
/**
* LLM response
*/
export interface LLMResponse {
text: string;
model: string;
usage?: {
promptTokens: number;
completionTokens: number;
totalTokens: number;
};
finishReason?: string;
provider: string;
providerId: string;
}
/**
* Parsed connection string components
*/
export interface ProviderConnectionString {
type: string; // Provider type (openai, anthropic, etc.)
credentials: string; // API key or token
endpoint?: string; // Optional custom endpoint
params: Record<string, string>; // Query parameters
}
/**
* Provider configuration
*/
export interface ProviderConfig {
id: string; // Unique ID (e.g., "provider-0")
type: string; // Provider type (openai, anthropic, etc.)
name: string; // Display name
credentials: string; // API key/token
endpoint?: string; // Optional custom endpoint
params: Record<string, string>; // Provider-specific parameters
modelPatterns: RegExp[]; // Patterns to match model strings
createModel: (modelName: string) => LanguageModel; // Factory function
}
/**
* Model patterns for each provider type
*/
const MODEL_PATTERNS: Record<string, RegExp[]> = {
openai: [/^gpt-/, /^o1-/, /^text-/],
anthropic: [/^claude-/],
bedrock: [/anthropic\.claude/, /^eu\.anthropic\.claude/, /^us\.anthropic\.claude/, /amazon\.titan/, /meta\.llama/, /cohere\.command/, /ai21\./, /mistral\./],
google: [/^gemini-/, /^models\/gemini/],
azure: [/^azure\//, /^deployment\//],
mistral: [/^mistral-/, /^open-mistral/],
cohere: [/^command-/, /^embed-/],
};
/**
* Parse a connection string into components
*
* Format: provider://credentials@endpoint?params
*
* @param connectionString - The connection string to parse
* @returns Parsed components
*/
export function parseConnectionString(connectionString: string): ProviderConnectionString {
try {
// For simple format provider://credentials, the credentials come after ://
// For endpoint format provider://credentials@endpoint, parse normally
let hasEndpoint = connectionString.includes('@');
if (!hasEndpoint) {
// Format: provider://credentials?params
// Extract parts manually
const protocolEnd = connectionString.indexOf('://');
if (protocolEnd === -1) {
throw new Error('Invalid URL');
}
const type = connectionString.substring(0, protocolEnd).toLowerCase();
const afterProtocol = connectionString.substring(protocolEnd + 3);
// Split by ? to separate credentials from params
const questionIndex = afterProtocol.indexOf('?');
let credentials: string;
let queryString = '';
if (questionIndex !== -1) {
credentials = afterProtocol.substring(0, questionIndex);
queryString = afterProtocol.substring(questionIndex + 1);
} else {
credentials = afterProtocol;
}
// Decode credentials
credentials = decodeURIComponent(credentials);
if (!type) {
throw new Error('Missing provider type in connection string');
}
if (!credentials) {
throw new Error('Missing credentials in connection string');
}
// Parse query parameters
const params: Record<string, string> = {};
if (queryString) {
const searchParams = new URLSearchParams(queryString);
searchParams.forEach((value, key) => {
params[key] = value;
});
}
return {
type,
credentials,
endpoint: undefined,
params,
};
}
// Format: provider://credentials@endpoint?params
// Extract manually to handle properly
const protocolEnd = connectionString.indexOf('://');
Iif (protocolEnd === -1) {
throw new Error('Invalid URL');
}
const type = connectionString.substring(0, protocolEnd).toLowerCase();
const afterProtocol = connectionString.substring(protocolEnd + 3);
// Find the @ separator
const atIndex = afterProtocol.indexOf('@');
Iif (atIndex === -1) {
throw new Error('Expected @ for endpoint format');
}
// Credentials are before @
let credentials = afterProtocol.substring(0, atIndex);
credentials = decodeURIComponent(credentials);
// Everything after @ is endpoint and params
const afterAt = afterProtocol.substring(atIndex + 1);
// Split by ? to separate endpoint from params
const questionIndex = afterAt.indexOf('?');
let endpoint: string;
let queryString = '';
if (questionIndex !== -1) {
endpoint = afterAt.substring(0, questionIndex);
queryString = afterAt.substring(questionIndex + 1);
} else {
endpoint = afterAt;
}
// Parse query parameters
const params: Record<string, string> = {};
if (queryString) {
const searchParams = new URLSearchParams(queryString);
searchParams.forEach((value, key) => {
params[key] = value;
});
}
Iif (!type) {
throw new Error('Missing provider type in connection string');
}
Iif (!credentials) {
throw new Error('Missing credentials in connection string');
}
return {
type,
credentials,
endpoint: endpoint || undefined,
params,
};
} catch (error) {
if (error instanceof Error && (error.message.includes('Invalid URL') || error.message.includes('Expected @'))) {
throw new Error(
`Invalid connection string format: "${connectionString}". ` +
`Expected format: provider://credentials@endpoint?params ` +
`Example: openai://sk-abc123 or bedrock://token?region=eu-central-1`
);
}
throw error;
}
}
/**
* Create an OpenAI provider instance
*/
function createOpenAIProvider(config: ProviderConnectionString) {
const options: any = {
apiKey: config.credentials,
};
Iif (config.endpoint) {
options.baseURL = `https://${config.endpoint}`;
}
return createOpenAI(options);
}
/**
* Create an AWS Bedrock provider instance
* Bedrock provides access to multiple foundation models from various providers
*
* Supports two authentication methods:
* 1. API Key authentication (recommended) - pass API key as credentials
* 2. AWS SigV4 authentication (fallback) - uses AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
*/
function createBedrockProvider(config: ProviderConnectionString) {
const region = config.params.region;
Iif (!region) {
throw new Error(
'AWS Bedrock configuration requires "region" parameter. ' +
'Example: bedrock://api-key?region=eu-central-1'
);
}
return createAmazonBedrock({
region,
// API key authentication (uses AWS_BEARER_TOKEN_BEDROCK internally)
apiKey: config.credentials,
});
}
/**
* Create a direct Anthropic provider instance
*/
function createAnthropicProvider(config: ProviderConnectionString) {
return createAnthropic({
apiKey: config.credentials,
});
}
/**
* Create a Google Gemini provider instance
*/
function createGoogleProvider(config: ProviderConnectionString) {
const options: any = {
apiKey: config.credentials,
};
// Optional location parameter
Iif (config.params.location) {
options.location = config.params.location;
}
return createGoogleGenerativeAI(options);
}
/**
* Create an Azure OpenAI provider instance
*/
function createAzureProvider(config: ProviderConnectionString) {
Iif (!config.endpoint) {
throw new Error(
'Azure OpenAI configuration requires endpoint. ' +
'Example: azure://key@endpoint.openai.azure.com?deployment=gpt4'
);
}
const deployment = config.params.deployment;
Iif (!deployment) {
throw new Error(
'Azure OpenAI configuration requires "deployment" parameter. ' +
'Example: azure://key@endpoint.openai.azure.com?deployment=gpt4'
);
}
return createAzure({
apiKey: config.credentials,
resourceName: config.endpoint.split('.')[0], // Extract resource name from endpoint
});
}
/**
* Create a Mistral provider instance
*/
function createMistralProvider(config: ProviderConnectionString) {
return createMistral({
apiKey: config.credentials,
});
}
/**
* Create a Cohere provider instance
*/
function createCohereProvider(config: ProviderConnectionString) {
return createCohere({
apiKey: config.credentials,
});
}
/**
* Provider factory registry
*/
const PROVIDER_FACTORIES: Record<string, (config: ProviderConnectionString) => any> = {
openai: createOpenAIProvider,
anthropic: createAnthropicProvider,
bedrock: createBedrockProvider,
google: createGoogleProvider,
azure: createAzureProvider,
mistral: createMistralProvider,
cohere: createCohereProvider,
};
/**
* Provider Registry - Singleton class managing all configured providers
*/
export class ProviderRegistry {
private static instance: ProviderRegistry | null = null;
private providers: Map<string, ProviderConfig> = new Map();
private initialized = false;
private constructor() {}
/**
* Get the singleton instance
*/
static getInstance(): ProviderRegistry {
Eif (!ProviderRegistry.instance) {
ProviderRegistry.instance = new ProviderRegistry();
}
return ProviderRegistry.instance;
}
/**
* Initialize providers from environment variables
* Reads QUIQR_LLM_PROVIDER_0 through QUIQR_LLM_PROVIDER_9
*/
initialize(): void {
if (this.initialized) {
return;
}
this.providers.clear();
// Read up to 10 provider configurations
for (let i = 0; i < 10; i++) {
const envVar = `QUIQR_LLM_PROVIDER_${i}`;
const connectionString = process.env[envVar];
if (!connectionString) {
continue;
}
try {
const parsed = parseConnectionString(connectionString);
const factory = PROVIDER_FACTORIES[parsed.type];
if (!factory) {
console.warn(
`⚠ Unknown provider type "${parsed.type}" in ${envVar}. ` +
`Supported types: ${Object.keys(PROVIDER_FACTORIES).join(', ')}`
);
continue;
}
// Create the provider instance
const providerInstance = factory(parsed);
// Create model factory function
const createModel = (modelName: string): LanguageModel => {
return providerInstance(modelName);
};
// Get model patterns for this provider type
const modelPatterns = MODEL_PATTERNS[parsed.type] || [];
// Create display name
let name = parsed.type.charAt(0).toUpperCase() + parsed.type.slice(1);
if (parsed.endpoint) {
name += ` (${parsed.endpoint})`;
}
if (parsed.params.region) {
name += ` [${parsed.params.region}]`;
}
const config: ProviderConfig = {
id: `provider-${i}`,
type: parsed.type,
name,
credentials: parsed.credentials,
endpoint: parsed.endpoint,
params: parsed.params,
modelPatterns,
createModel,
};
this.providers.set(config.id, config);
console.log(`✓ Registered ${config.id}: ${config.name}`);
} catch (error) {
console.error(
`✗ Failed to configure ${envVar}:`,
error instanceof Error ? error.message : error
);
}
}
this.initialized = true;
}
/**
* Get a provider by ID or by matching model string
*
* @param modelOrProviderId - Provider ID (e.g., "provider-0") or model string (e.g., "gpt-4")
* @returns Provider configuration
*/
getProvider(modelOrProviderId: string): ProviderConfig {
if (!this.initialized) {
this.initialize();
}
// Check if it's a direct provider ID
if (this.providers.has(modelOrProviderId)) {
return this.providers.get(modelOrProviderId)!;
}
// Try to match by model pattern
const matched = this.matchByModel(modelOrProviderId);
if (matched) {
return matched;
}
// No match found - provide helpful error
const availableProviders = Array.from(this.providers.values())
.map(p => `${p.id} (${p.type})`)
.join(', ');
throw new Error(
`No provider found for model "${modelOrProviderId}". ` +
`Available providers: ${availableProviders || 'none configured'}. ` +
`Configure providers using QUIQR_LLM_PROVIDER_0, QUIQR_LLM_PROVIDER_1, etc.`
);
}
/**
* Match a model string against provider patterns
* Returns the first matching provider (registration order)
*/
private matchByModel(model: string): ProviderConfig | null {
for (const provider of this.providers.values()) {
for (const pattern of provider.modelPatterns) {
if (pattern.test(model)) {
return provider;
}
}
}
return null;
}
/**
* List all configured providers
*/
listProviders(): ProviderConfig[] {
Iif (!this.initialized) {
this.initialize();
}
return Array.from(this.providers.values());
}
/**
* Check if a provider exists
*/
hasProvider(providerId: string): boolean {
Iif (!this.initialized) {
this.initialize();
}
return this.providers.has(providerId);
}
/**
* Get provider count
*/
getProviderCount(): number {
Iif (!this.initialized) {
this.initialize();
}
return this.providers.size;
}
}
/**
* Call LLM with the given request
*
* @param request - LLM request parameters
* @returns LLM response with text and metadata
*/
export async function callLLM(request: LLMRequest): Promise<LLMResponse> {
const registry = ProviderRegistry.getInstance();
// Get provider (either explicit or by model matching)
const providerConfig = registry.getProvider(request.provider || request.model);
console.log(`\nUsing provider: ${providerConfig.id} (${providerConfig.name})`);
console.log(`Model: ${request.model}`);
// Get the model instance
const model = providerConfig.createModel(request.model);
// Set default values
const temperature = request.temperature ?? 0.7;
const maxTokens = request.maxTokens ?? 4096;
console.log(`Temperature: ${temperature}, Max tokens: ${maxTokens}`);
try {
// Call the LLM using generateText (non-streaming)
// For OpenAI models, use maxCompletionTokens (newer parameter name)
// For other providers, use maxTokens
const generateOptions: Parameters<typeof generateText>[0] = {
model,
prompt: request.prompt,
temperature,
...(providerConfig.type === 'openai'
? { maxCompletionTokens: maxTokens }
: { maxTokens }
),
};
const result = await generateText(generateOptions);
// Extract response data
const response: LLMResponse = {
text: result.text,
model: request.model,
provider: providerConfig.type,
providerId: providerConfig.id,
finishReason: result.finishReason,
};
// Add usage stats if available
if (result.usage) {
response.usage = {
promptTokens: result.usage.inputTokens || 0,
completionTokens: result.usage.outputTokens || 0,
totalTokens: result.usage.totalTokens || 0,
};
}
return response;
} catch (error: unknown) {
console.error('LLM call failed:', error);
if (!(error instanceof Error)) {
throw new Error(
`Failed to call ${providerConfig.name}: ${error}`
);
}
// Provide more helpful error messages
if (error.message.includes('401') || error.message?.includes('authentication')) {
throw new Error(
`Authentication failed for ${providerConfig.name}. ` +
`Please check your API credentials in ${providerConfig.id}.`
);
} else if (error.message.includes('rate limit')) {
throw new Error(
`Rate limit exceeded for ${providerConfig.name}. ` +
`Please try again later.`
);
} else if (error.message.includes('timeout')) {
throw new Error(
`Request timed out while calling ${providerConfig.name}. ` +
`Please try again.`
);
}
// Re-throw with provider context
throw new Error(
`Failed to call ${providerConfig.name}: ${error.message}`
);
}
}
/**
* Initialize and validate LLM provider configuration at startup
*
* @returns Summary of configured providers
*/
export function initializeLLMProviders(): {
count: number;
providers: Array<{
id: string;
type: string;
name: string;
modelExamples: string[];
}>;
warnings: string[];
} {
const warnings: string[] = [];
const registry = ProviderRegistry.getInstance();
console.log('\n' + '='.repeat(60));
console.log('Initializing LLM Providers');
console.log('='.repeat(60));
// Initialize registry (reads environment variables)
registry.initialize();
const configuredProviders = registry.listProviders();
if (configuredProviders.length === 0) {
warnings.push(
'No LLM providers configured. Set QUIQR_LLM_PROVIDER_0, QUIQR_LLM_PROVIDER_1, etc.'
);
console.warn('⚠ No LLM providers configured');
console.warn(' Set environment variables QUIQR_LLM_PROVIDER_0 through QUIQR_LLM_PROVIDER_9');
console.warn(' Format: provider://credentials@endpoint?params');
console.warn(' Example: QUIQR_LLM_PROVIDER_0="openai://sk-abc123"');
} else {
console.log(`\n✓ ${configuredProviders.length} provider(s) configured:\n`);
configuredProviders.forEach((provider) => {
// Generate example models based on patterns
const modelExamples: string[] = [];
if (provider.type === 'openai') {
modelExamples.push('gpt-4', 'gpt-3.5-turbo');
I} else if (provider.type === 'anthropic') {
modelExamples.push('claude-3-5-sonnet', 'claude-3-opus');
} else if (provider.type === 'bedrock') {
modelExamples.push('anthropic.claude-3-5-sonnet', 'meta.llama3', 'amazon.titan-text');
} else if (provider.type === 'google') {
modelExamples.push('gemini-pro', 'gemini-1.5-pro');
I} else if (provider.type === 'azure') {
modelExamples.push('azure/gpt-4');
} else if (provider.type === 'mistral') {
modelExamples.push('mistral-large', 'mistral-medium');
E} else if (provider.type === 'cohere') {
modelExamples.push('command-r-plus', 'command-r');
}
console.log(` ${provider.id}: ${provider.name}`);
console.log(` Type: ${provider.type}`);
console.log(` Example models: ${modelExamples.join(', ')}`);
console.log('');
});
}
console.log('='.repeat(60) + '\n');
return {
count: configuredProviders.length,
providers: configuredProviders.map((p) => {
const modelExamples: string[] = [];
if (p.type === 'openai') {
modelExamples.push('gpt-4', 'gpt-3.5-turbo');
I} else if (p.type === 'anthropic') {
modelExamples.push('claude-3-5-sonnet');
} else if (p.type === 'bedrock') {
modelExamples.push('anthropic.claude-3-5-sonnet');
} else if (p.type === 'google') {
modelExamples.push('gemini-pro');
I} else if (p.type === 'azure') {
modelExamples.push('azure/gpt-4');
} else if (p.type === 'mistral') {
modelExamples.push('mistral-large');
E} else if (p.type === 'cohere') {
modelExamples.push('command-r-plus');
}
return {
id: p.id,
type: p.type,
name: p.name,
modelExamples,
};
}),
warnings,
};
}
/**
* Get provider display name (for backward compatibility)
* @deprecated Use ProviderRegistry instead
*/
export function getProviderDisplayName(providerType: string): string {
const registry = ProviderRegistry.getInstance();
const providers = registry.listProviders();
const provider = providers.find(p => p.type === providerType);
return provider ? provider.name : providerType;
}
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